US9946074B2 - See-through curved eyepiece with patterned optical combiner - Google Patents
See-through curved eyepiece with patterned optical combiner Download PDFInfo
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- US9946074B2 US9946074B2 US15/093,235 US201615093235A US9946074B2 US 9946074 B2 US9946074 B2 US 9946074B2 US 201615093235 A US201615093235 A US 201615093235A US 9946074 B2 US9946074 B2 US 9946074B2
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- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
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Definitions
- This disclosure relates generally to the field of optics, and in particular, relates to see-through head wearable displays.
- a head mounted display (“HMD”) or head wearable display is a display device worn on or about the head.
- HMDs usually incorporate some sort of near-to-eye optical system to create a magnified virtual image placed a few meters in front of the user.
- Single eye displays are referred to as monocular HMDs while dual eye displays are referred to as binocular HMDs.
- Some HMDs display only a computer generated image (“CGI”), while other types of HMDs are capable of superimposing CGI over a real-world view.
- CGI computer generated image
- This latter type of HMD typically includes some form of see-through eyepiece and can serve as the hardware platform for realizing augmented reality.
- augmented reality the viewer's image of the world is augmented with an overlaying CGI, also referred to as a heads-up display (“HUD”).
- HUD heads-up display
- HMDs have numerous practical and leisure applications. Aerospace applications permit a pilot to see vital flight control information without taking their eye off the flight path. Public safety applications include tactical displays of maps and thermal imaging. Other application fields include video games, transportation, and telecommunications. There is certain to be new found practical and leisure applications as the technology evolves; however, many of these applications are limited due to the cost, size, weight, thickness, field of view, efficiency, and image quality of conventional optical systems used to implement existing HMDs.
- FIG. 1 is a cross-sectional illustration of an optical system for use with a head wearable display, in accordance with an embodiment of the disclosure.
- FIG. 2 is a perspective view illustration of a head wearable display including a curved eyepiece, in accordance with an embodiment of the disclosure.
- FIG. 3 is a perspective view illustration of the curved eyepiece and a display panel, in accordance with an embodiment of the disclosure.
- FIGS. 4A, 4B, and 4C all illustrate different perspective views of the first and second lens bodies that mate together to form the curved eyepiece, in accordance with an embodiment of the disclosure.
- FIGS. 5A, 5B, 5C, and 5D illustrate different patterns of reflective elements for implementing an optical combiner within the curved eyepiece, in accordance with embodiments of the disclosure.
- FIG. 6 provides a sag equation along with example coefficients for characterizing the surfaces of a demonstrative curved lightguide, in accordance with an embodiment of the disclosure.
- Embodiments of an apparatus, system and method of operation for a curved eyepiece with a patterned optical combiner are described herein.
- numerous specific details are set forth to provide a thorough understanding of the embodiments.
- One skilled in the relevant art will recognize, however, that the techniques described herein can be practiced without one or more of the specific details, or with other methods, components, materials, etc.
- well-known structures, materials, or operations are not shown or described in detail to avoid obscuring certain aspects.
- FIG. 1 is a cross-sectional illustration of an optical system 100 for use with a head wearable display, in accordance with an embodiment of the disclosure.
- the illustrated embodiment of optical system 100 includes a display panel 105 , a polarization rotator 110 , a prism 115 , and a curved eyepiece 120 .
- the illustrated embodiment of curved eyepiece 120 includes a first lens body 125 , in which a curved lightguide 127 is disposed, a second lens body 130 , an optical combiner 135 , an input surface 140 , a convex world facing surface 145 , and a concave eye-ward facing surface 150 .
- Optical system 100 is well suited for use with head wearable displays having a near eye configuration.
- curved eyepiece 120 receives display light 155 generated by display panel 105 through an input surface 140 peripherally located from a viewing region 160 and emits display light 155 along an eye-ward direction in viewing region 160 toward a user's eye 165 within an eyebox 170 .
- display light 155 is guided within curved lightguide 127 by total internal reflection between input surface 140 and optical combiner 135 .
- angularly selective reflective coatings e.g., multi-layer dichroic film stack
- curved eyepiece 120 is see-through allowing the user to see ambient light incident through world facing surface 145 .
- display panel 105 During operation, display panel 105 generates display light 155 to form a display image (e.g., computer generated image).
- Display panel 105 may be implemented using a variety of display technologies including liquid crystal (“LC”) displays, light emitting diode (“LED”) displays, organic LED (“OLED”) displays, LC on silicon (“LCoS”) displays, or other micro display technologies.
- LC liquid crystal
- LED light emitting diode
- OLED organic LED
- LCD LC on silicon
- display light 155 is optionally directed through a polarization rotator 110 .
- Polarization rotator 110 is orientated to align a linear polarization of display light 155 with a centerline of curved lightguide 127 to reduce asymmetries in birefringence.
- the centerline represents an axis of symmetry down the center of curved lightguide 127 .
- polarization rotator 110 is a half-wave plate rotator with an angular rotation ⁇ about a normal vector (axis 106 ) of the emission surface of display panel 105 .
- Polarization rotator 110 may be used in embodiments where display panel 105 is a polarized display (e.g., LCoS, micro-LCD).
- Display light 155 is further directed through prism 115 prior to entering into curved lightguide 127 .
- Prism 115 is disposed proximate to input surface 140 to pre-compensate display light 155 for lateral chromatic aberrations resulting from reflections (e.g., total internal reflections) within curved lightguide 127 .
- Lateral chromatic aberration is deleterious to image quality since it causes color components of a color image to separate or offset laterally.
- Prism 115 is designed to pre-compensate for this chromatic separation.
- display panel 105 and prism 115 are orientated relative to curved eyepiece 120 such that chief rays 175 of display light 155 output from the pixels of display panel 105 are guided through curved lightguide 127 and directed substantially through the center of eyebox 170 .
- Each pixel of display panel 105 has its own chief ray, which ideally, is the center normal ray projecting out from the given display pixel.
- curved eyepiece 120 is designed such that the chief ray from each pixel passes through a center of eyebox 170 with each chief ray passing through the center at a different angle due to each pixel's different location on display panel 105 . In other words, pixel location on display panel 105 is translated into a ray angle at eyebox 170 .
- the chief ray 175 of a given pixel to be a ray emitted from display panel 105 within a cone having a three degree arc from normal (as measured from an emission surface of display panel 105 ) for that given pixel.
- This “chief ray” is close enough to normal for practical implementations.
- prism 115 facilitates the reduction of the size of input surface 140 along with compensation of axial and lateral chromatic aberrations.
- prism 115 could be omitted by tilting display panel 105 to a more oblique angle relative to input surface 140 ; however, doing so results in a larger input surface 140 , which changes the end shape of curved eyepiece 120 near input surface 140 and reduces image brightness.
- Curved eyepiece 120 imparts refractive optical power at input surface 140 and upon emission of display light 155 out eye-ward facing surface 150 .
- the illustrated embodiment of curved eyepiece 120 imparts reflective optical power via four total internal reflection interactions and one reflection off of optical combiner 135 . The optical power interactions collectively serve to magnify the display image and displace the virtual image so that the user can bring the image into focus in a near-eye configuration. It should be appreciated that curved eyepiece 120 may be implemented with other number of reflective bounces to transport display light 155 from the peripheral input region to optical combiner 135 .
- FIG. 6 presents a sag equation with example coefficient values specifying example curvatures for the surfaces of curved lightguide 127 including: eye-ward facing surface 150 (S 1 ), optical combiner surface 135 (S 2 ), an outward facing surface (S 3 ), and input surface 140 (S 4 ).
- Surfaces S 1 -S 4 all reside on lens body 125 and define curved lightguide 127 .
- FIG. 6 also presents example coordinates for positioning surfaces S 1 through S 4 . Of course, other curvatures, flat surfaces, and coordinates may be implemented.
- surfaces S 1 and S 3 are described a spherical surfaces, in other embodiments, one or more of these surfaces may be described as a freeform surface, a rotationally symmetric asphere surface, an anamorphic asphere surface, a toroid surface, a Zernike polynomial surface, a radial basis function surface, an x-y polynomial surface, a non-uniform rational b-spline surface, or otherwise.
- optical combiner 135 is implemented using a pattern of reflective elements separated by interstitial regions.
- the reflective elements reflect display light 155 while the interstitial regions pass ambient light 156 incident through world facing surface 145 such that viewing region 160 (and optical combiner 135 ) are partially see-through.
- the interstitial regions are gaps between adjacent reflective elements.
- FIGS. 5A-5D illustrates example patterns of reflective elements separated by interstitial regions.
- FIGS. 5A-5D illustrate example implementations for optical combiner 135 .
- FIG. 5A illustrates an example grid pattern 505 of reflective elements 510 separated by interstitial region 515 .
- reflective elements 510 are rectangular shaped elements.
- FIG. 5B illustrates an example grid pattern 520 of reflective elements 525 separated by interstitial region 530 .
- reflective elements 525 are circular or elliptical elements.
- FIG. 5C illustrates an example grid pattern 535 of reflective elements 540 separated by interstitial region 545 .
- reflective elements 540 are hexagonal shaped elements.
- FIG. 5A illustrates an example grid pattern 505 of reflective elements 510 separated by interstitial region 515 .
- reflective elements 510 are rectangular shaped elements.
- FIG. 5B illustrates an example grid pattern 520 of reflective elements 525 separated by interstitial region 530 .
- reflective elements 525 are circular or elliptical
- 5D illustrates an example radial pattern 545 of reflective elements 550 separated by interstitial region 555 .
- reflective elements 550 are circular or elliptical shaped elements. It is appreciated that the reflective elements may be implemented with other geometric shapes and may be arranged into other distribution patterns. For example, the reflective elements may have a Bezier shape, or the distribution pattern may be described via a polynomial distribution, a pseudo random distribution pattern, or otherwise. Furthermore, the combination of distribution pattern and element shape is not limited to the demonstrative combinations illustrated in FIGS. 5A-5D .
- the reflective elements are implemented as opaque reflectors.
- An example opaque reflector includes a sufficiently thick layer of metal (e.g., aluminum, silver, etc.) that substantially reflects all visible light incident upon a surface of a given reflective element. Other opaque reflective materials may be used.
- the reflective elements may be partial reflectors or beam splitters (e.g., thin silver coating, multilayer dielectric thin film, etc.). In either embodiment, the total surface area fill factor of the partial reflectors to interstitial elements is selected such that optical combiner 135 is overall more transmissive than reflective. In one embodiment, optical combiner 135 is overall less than 30% reflective to incident visible light.
- the total surface area fill factor of the reflective elements to interstitial regions is covered less than 30% by the reflective elements to achieve an overall reflectivity of less than 30%. Accordingly, by adjusting the fill factor of reflective elements, the overall reflectivity of optical combiner 135 can be adjusted. In one embodiment, optical combiner 135 is overall 15% reflective and 85% transmissive. Of course, other reflective/transmissive ratios may be implemented to achieve a viewing region 160 that is partially transmissive to ambient light 156 incident through world facing surface 145 such that viewing region 160 is see-through.
- the individual reflective elements of optical combiner 135 are sized to prevent diffraction of display light 155 upon reflection. Accordingly, the surface area and perimeter shape of the reflective elements are selected to have a minimum size and shape that substantially does not induce diffraction at visible wavelengths.
- the reflective elements may have a diameter or width of greater than 100 um (or surface area of greater than 7,850 um 2 . In various embodiments, the reflective elements have a diameter or width ranging between 100 um to 500 um.
- 500 um feature sizes e.g., 500 um diameter or width
- 500 um feature sizes are expected to be small enough to not be visible to the user in a near-to-eye configuration.
- FIG. 2 is a perspective view illustration of a head wearable display 200 that incorporates a left and right instance of optical system 100 with left and right instances of curved eyepiece 120 , in accordance with an embodiment of the disclosure.
- Curved eyepieces 120 are mounted to a frame assembly, which includes a nose bridge 205 , left ear arm 210 , and right ear arm 215 .
- Interior cavities 220 and 225 within left ear arm 210 and right ear arm 215 may contain various electronics including a microprocessor, interfaces, one or more wireless transceivers, a battery, a speaker, a controller, etc.
- either of nose bridge 205 or the front facing corners of ear arms 210 , 215 may contain a camera module for capturing forward facing images of the external scene or rear facing images of the user's eye(s).
- FIG. 2 illustrates a binocular embodiment
- head wearable display 200 may also be implemented as a monocular display with only one curved eyepiece 120 aligned with only a single user eye when worn.
- curved eyepieces 120 are edged to conform to the shape of the frame assembly and secured into an eye glass arrangement so head wearable display 200 can be worn on the head of a user.
- the left and right ear arms 210 and 215 rest over the user's ears while nose bridge 205 rests over the user's nose.
- the frame assembly is shaped and sized to position viewing regions 160 (including optical combiners 135 ) in front of the user's eyes.
- optical combiners 135 are positioned relative to the user's eyes such that the user looks slightly down (e.g., 7 degrees) and to the right or left (e.g., 15 degrees) to see the display image.
- Optical combiners 135 within viewing regions 160 operate to redirect display light 155 to each eye while allowing ambient light 156 to pass through, thereby providing the user with an augmented view of the real-world.
- FIG. 3 is a perspective view illustration of curved eyepiece 120 and display panel 105 , in accordance with an embodiment of the disclosure.
- curved lightguide 127 guides display light 155 output from display panel 105 and received through input surface 140 to optical combiner 135 .
- FIG. 3 further illustrates how curved eyepiece 120 is formed from two lens bodies 125 and 130 mated together.
- curved lightguide 127 is disposed entirely within lens body 125 , while lens body 130 completes the overall eyepiece to provide a see-through lens without distortion of ambient light 156 and a clean industrial design.
- FIGS. 4A, 4B, and 4C illustrate different exploded view illustrations of lens bodies 125 and 130 , in accordance with an embodiment of the disclosure.
- FIGS. 4B and 4C illustrate an exploded view of just lens body 125 (each from a different angle) while FIG. 4A illustrates an exploded view of just lens body 130 .
- lens body 130 includes a thin portion 405 , a thick portion 410 , and a transition surface 415 disposed at the transition between thin portion 405 and thick portion 410 .
- the illustrated embodiment of lens body 125 includes a thin portion 420 , a thick portion 425 , and a transition surface 430 disposed at the transition between thin portion 420 and thick portion 425 .
- lens body 125 is mated to lens body 130 using a clear adhesive having a refractive index that is less than the refractive index of lens bodies 125 and 130 .
- the low index clear adhesive forms a total internal reflection (“TIR”) boundary between the two lens bodies 125 and 130 , which defines an interior boundary of curved lightguide 127 within thick portion 425 of lens body 125 .
- TIR total internal reflection
- the low index clear adhesive can be applied to surface 416 ( FIG. 4A ) and/or surface 417 ( FIG. 4B ) to form the TIR boundary.
- the same adhesive may also be applied to bond the other interface surfaces between lens body 125 and lens body 130 .
- Other coatings, such as an angle sensitive multi-layer dichroic coating may also be used to form the internal reflective boundary.
- Viewing region 160 of curved lightguide 127 is defined by optical combiner 135 disposed at the junction or interface between transition surfaces 415 and 430 when lens bodies 130 and 125 are mated together.
- optical combiner 135 may be formed onto one of or both of transition surfaces 415 or 430 .
- optical combiner 135 need not cover the entire extent of transition surfaces 415 or 430 , but rather may cover just a portion thereof.
- the reflective elements of optical combiner 135 conform to the curvature of transition surfaces 415 and 430 . As such, the this curvature introduces optical power in reflection to display light 155 , while being substantially transparent to ambient light 156 that passes through the interstitial regions between the reflective elements.
- Curved eyepiece 120 is implemented as a thin, curved eyepiece having a thickness less than 8 mm, and in one embodiment is about 4.0 mm thick.
- Lens bodies 125 and 130 may be formed of transparent optical grade plastic (e.g., polycarbonate, etc) having an index of refraction of 1.64.
- a direct benefit of using higher index material is to reduce the angle at which TIR occurs. This effectively enables designs that reduce the angle of the output coupler, which can either increase the size of the eyebox for a given curved lightguide thickness or reduce the overall thickness of the curved eyepiece for a given eyebox size.
- Using higher index material for the curved eyepiece can also provide greater flexibility in the refractive index of the optical grade adhesives used to bond the lens bodies 125 and 130 together.
- curvatures of both eye-ward facing surface 150 and world-facing surface 145 may be implemented as spherical surfaces. Collectively, the curvature and slim nature of curved eyepiece 120 provide a desirable industrial design. Curved eyepiece 120 not only has desirable industrial design, but is also efficient since ideally the only lossy bounce for display light 155 traveling from input surface 140 to optical combiner 135 is the single redirection by optical combiner 135 itself. This permits optical combiner 135 and viewing region 160 to be substantially more transmissive than reflective thereby improving the see-through characteristic of curved eyepiece 120 in viewing region 160 .
- world facing surface 145 provides a complementary curvature to offset the optical power of the curvature of eye-ward facing surface 150 encountered by ambient light 156 .
- lens bodies 125 and 130 are fabricated of the same transparent materials or transparent materials having substantially the same index of refraction.
- curved eyepiece 120 operates as a see-through display, which combines ambient light 156 with display light 155 directed out viewing region 160 along an eye-ward direction into eye 165 .
- curved eyepiece 120 is capable of displaying an augmented reality to eye 165 ; however, the combined curvatures of world facing surface 145 and eye-ward facing surface 150 of curved eyepiece 120 complement each other and collectively do not impart lensing power to ambient light 156 as it passes through curved eyepiece 120 in viewing region 160 . In other embodiments, the curvatures of world facing surface 145 and eye-ward facing surface 150 may be unbalanced to impart prescriptive lensing to ambient light 156 .
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Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/093,235 US9946074B2 (en) | 2016-04-07 | 2016-04-07 | See-through curved eyepiece with patterned optical combiner |
EP16813276.9A EP3380885B1 (fr) | 2016-04-07 | 2016-12-01 | Oculaire courbe transparent avec combineur faconné |
PCT/US2016/064418 WO2017176323A1 (fr) | 2016-04-07 | 2016-12-01 | Oculaire incurvé transparent doté d'un combinateur optique à motifs |
GBGB1620788.8A GB201620788D0 (en) | 2016-04-07 | 2016-12-07 | See-through curved eyepiece with patterned optical combiner |
GB1620780.5A GB2549159B (en) | 2016-04-07 | 2016-12-07 | See-through curved eyepiece with patterned optical combiner |
DE202016106927.0U DE202016106927U1 (de) | 2016-04-07 | 2016-12-13 | Durchsichtiges gekrümmtes Okular mit strukturiertem Optik-Kombinator |
DE102016224853.7A DE102016224853A1 (de) | 2016-04-07 | 2016-12-13 | Durchsichtiges gekrümmtes Okular mit strukturiertem Optik-Kombinator |
CN201611234914.XA CN107272184B (zh) | 2016-04-07 | 2016-12-28 | 具有图案化光学合路器的透视弯曲目镜 |
CN201621455926.0U CN206741082U (zh) | 2016-04-07 | 2016-12-28 | 与头戴式显示器一同使用的设备以及该头戴式显示器 |
US15/924,770 US10754160B2 (en) | 2016-04-07 | 2018-03-19 | See-through curved eyepiece with patterned optical combiner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US15/093,235 US9946074B2 (en) | 2016-04-07 | 2016-04-07 | See-through curved eyepiece with patterned optical combiner |
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US15/924,770 Continuation US10754160B2 (en) | 2016-04-07 | 2018-03-19 | See-through curved eyepiece with patterned optical combiner |
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US20170293144A1 US20170293144A1 (en) | 2017-10-12 |
US9946074B2 true US9946074B2 (en) | 2018-04-17 |
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EP (1) | EP3380885B1 (fr) |
CN (2) | CN107272184B (fr) |
DE (2) | DE102016224853A1 (fr) |
GB (2) | GB2549159B (fr) |
WO (1) | WO2017176323A1 (fr) |
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WO2020257713A1 (fr) * | 2019-06-20 | 2020-12-24 | Firefly Dimension Inc. | Système, appareil et système de réalité augmentée monté sur la tête |
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EP3380885A1 (fr) | 2018-10-03 |
GB201620788D0 (en) | 2017-01-18 |
CN107272184A (zh) | 2017-10-20 |
DE202016106927U1 (de) | 2017-07-10 |
CN107272184B (zh) | 2019-06-04 |
DE102016224853A1 (de) | 2017-10-12 |
CN206741082U (zh) | 2017-12-12 |
EP3380885B1 (fr) | 2021-04-28 |
GB2549159B (en) | 2020-12-30 |
US20170293144A1 (en) | 2017-10-12 |
GB2549159A (en) | 2017-10-11 |
US20180252923A1 (en) | 2018-09-06 |
US10754160B2 (en) | 2020-08-25 |
WO2017176323A1 (fr) | 2017-10-12 |
GB201620780D0 (en) | 2017-01-18 |
WO2017176323A9 (fr) | 2018-01-04 |
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